The Sovtek 12AX7WB is very close in sound to the 12AX7WA.
There is however a distinctive boost in the low-end of the
12AX7WB.
The Sovtek 12AX7WB is a miniature type used as a phase
inverter or amplifier in AC / DC radio equipment and in
many diversified applications such a multivibrators or
oscillators in industrial control devices. They require
a noval 9-contact socket.
This tube is also a main stay in many Guitar
and Bass Amplifiers and is Great for Marshall Amps
for its gustsier characteristics.
The 12AX7WB also gives you extra Punch in
big amps.
Electrical Data:
Heater Voltage ........................ 6.3/12.6 V
Heater Current ........................ 0.3/0.15 A
Preferred Substitutes .... 12AX7, 12AX7A, 12AX7EH,
12AX7LPS, 12AX7R, 12AX7WB7025, 12DF7, 12DM7, ECC83,
ECC803
Substitutes
.................................. 12AD7
Click Here For INTERESTING TUBE FACTS
on 12AX7's